document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=233975>Question 233975</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Simplify (not solve!):\r<BR>\n" );
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document.write( "a.<BR>\n" );
document.write( "   Sin8a + Sin9a + Sin10a + Sin11a + Sin12a    <BR>\n" );
document.write( "Cos 8a + Cos9a + Cos10a + Cos11a + Cos12a\r<BR>\n" );
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document.write( "b.<BR>\n" );
document.write( "Cos^2[ (3pi/8) + (a/4) ] - Cos^2 [ (11pi/8) + (a/4) ]\r<BR>\n" );
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document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #172614 by </B><A HREF=/tutors/aboutme.mpl?userid=nyc_function><B>nyc_function(2741)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=nyc_function><IMG SRC=http://www.algebra.com/images/aboutme-small.gif BORDER=0 alt=\"About Me\" VALIGN=MIDDLE></A>&nbsp;<IMG SRC=http://www.algebra.com/cgi-bin/show-face.mpl?user=nyc_function><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=172614\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> All you have to do is combine like terms.\r<BR>\n" );
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document.write( "I will do (a) and you can do (b).\r<BR>\n" );
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document.write( "Sin8a + Sin9a + Sin10a + Sin11a + Sin12a    <BR>\n" );
document.write( "Cos 8a + Cos9a + Cos10a + Cos11a + Cos12a = sin50a + cos50a\r<BR>\n" );
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